Stencil duplicating machine



O -v M. B. BRAND' STENCIL DUPLICATING MACHI NE Filed Dec. 7, 1954 Patented Nov. 19, 1935 UhliTED STATES PATENT QFFHIE Maurice B. Brand, Chicago, 111., assignor of onehalf to Louis H. Freise, Chicago, Ill.

Application December '7, 1934, SerialNo. 756,421 In Canada May 7, 1934 2 Claims.

This invention relates to improvements in stencil duplicating machines and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

One of the objects of the invention is to provide an improved mounting for the impression roll of the machine, whereby the same is yieldingly held in a guided path so that it will adjust itself toward and away from the associated printing cylinder toaccommodate the feeding of paper of different thicknesses as desired.

Still another object of the invention is to provide a mountingof this kind which includes impression roller bearing blocks, formed for guided engagement in openings in the side frames, in a manner preventing any undesired movement of the blocks that wouldtend to cause a binding thereof in the side frames, and which would result in the .production of imperfect impressions. A further object of the invention is to provide in a machine of this kind, a novel means for connecting the stencil and inking pad to the associated perforated supporting sheet or cylinder segment, to form a unit that may be quickly removed and replaced, thus making it practical to remove the unit and substitute a different one therefor, in multi-color ink work.

The above mentioned objects of the invention, as well as others, together with the many advantages thereof, will more fully appear as I proceed with my specification.

In the drawing:

Fig. 1 is a view in side elevation of a stencil duplicating machine embodying the preferred form of the invention;

Fig. 2 is a fragmentary view in elevation, illustrating the manner of attaching one end of an ink pad and a stencil to the associated end of a perforated supporting member or cylinder seg ment;

Fig. 3 is a fragmentary View in elevation, illustrating the manner of attaching the other 'end of the ink pad and the stencil to the associated end of the perforated supporting member;

Fig. l is a detail sectional view through a part of the machine on an enlarged scale as taken on the line id of Fig. 1;

Fig. 5 is a detail sectional View on an enlarged scale as taken on the line 5--5 of Fig. 3; and

Fig. 6 is a detail sectional view also on an enlarged scale as taken on the line 6-6 of Fig. 2.

Referring now in detail to that embodiment of the invention, illustrated in the accompanying drawing:

'5 indicates one of the side plates of themachine, each preferably made as a sheet metal stamping. Each side plate is provided at the top, on the outside thereof, with a bearing bushing 8. J ournalled in said bushings is a horizontal shaft 9 for the cylinder it, as a whole. To one 5 end of said shaft, outside of one of the side plates is fixed a crank H by which the cylinder is rotated. Each bearing 3 is provided with an ear 12, the purpose of which will soon appear.

In each side plate is formed an opening it with 10 an enlarged bottom end M, thus providing a shoulder [5 at the junction of said opening and its enlarged bottom end. The side edges l 6 of the opening are parallel with a plane radial with respect to the shaft 9 and said plane is disposed 16 at an inclination to the perpendicular.

ll indicates a bearing block, there being one of such biocks associated with the opening it in each side plate. This block is provided in oppositesides with a groove it for sliding guided 20 engagement with those parts of each side plate defining the opening it therein. This block is so proportioned as to be capable of insertion into the enlarged bottom end 54 of an associated opening I3 and then moved upwardly therein so 25 as to engage the grooves ill of the block with those portions of the side plate that define the side edges l6 of said opening it. Journalled in said blocks are the ends of a horizontal shaft Ila. An impression roll i9 is fixed to said 30 shaft between said bearing blocks to cooperate with the cylinder it. Each block is provided at its top end, outside the associated side plate, With an ear iii. A helical spring 2! has its ends engaged in associated ears l2 and 2t respective- 35 ly. These springs normally act to hold the roll 19 in peripheral engagement with the cylinder and will yield to accommodate paper of different thicknesses as the same is fed to the machine.

On the bottom end of each block there is pivoted as at 22, a bell crank lever 23 (see Fig. 4). This lever includes a locking arm '24 and a manipulating arm 25. When it is desired to hold theimpression roll it in spaced relation with respect to the cylinder iii, the blocks H are moved downward. in their openings 53 until the lever is arranged slightly below the shoulders l5. The arm 25 of each lever is then swung outwardly away from the asscciatedside plate and this will bring the short and into position to 50 engage one of the shoulders it before mentioned. This Will hold the roll l9 spaced from the cylinder for cleaning and the like. To bring the impression roll back into operative relation with respect to the cylinder, the levers 23 are 55 The cylinder 10 includes a pair of wheel-like end heads 26-26 each suitably fixed to the shaft Q just within an associated side plate. Each end head also is provided with an inwardly extending segmental flange 2?, for the detachable support of a duplicating unit in a manner presently to appear. Each unit includes a perforated, thin flexible metallic sheet 28 of a length approximating the peripheral lengthof the segmental flange 21. This sheet, which provides the supporting segment for the pad and the stencil of the, machine, has imperforate margins 29 for engagement upon the V flanges 2l21. The peripheral length of said flanges is such as to provide an opening in the cylinder for access to the interior thereof when so desired. In each imperforate margin 29 of the sheet 28, are provided longitudinal slots 30 through which extend fastening devices carried by the flanges 21. When the devices are disposed longitudinaL 137 of the slots 39, they can pass through the same to permit the removal and replacement of the sheet 23. After the sheet 28 has been thus ap plied the devices 3! are turned to stand transversely of the associated slots to lock the sheet 7 to the end heads.

depressed trough or groove 32 and an inwardly j extending flange 33 that carries buttons 34 thereon. A part of the metal of the sheet 28 that is formed to provide the ends of the groove 32, is

slit and'upset outwardly to provide keeper ears 3535, onearranged in the plane of each'im perforate margin 29 of the sheet 28. pose of said ears will appear later.

The other end of'said sheet 28 is formed to The purprovide a deeper and wider groove 36. as best shown in Fig. 5. V

3'! indicates the ink pad supported upon the sheet or segment 28. enough to cover the perforated portion of the sheet or segment and is provided at one end with a loop-like pocket 38 to receive a keeper rod 39,

. the end of which engages in the cars 35 before mentioned. The pad which has a length approximating that 'of the perforatedsupporting sheet or segment 28 is provided at its other end with a loop-like pocket 4!! to receive a part 4! of a folding rule-like bar 42. The other part 43 of said bar is pivoted at one end to an end of the 7 part 4| as indicated at 44 in Fig. 3.

' 45 indicates the stencil sheet which is provided at one end with openings 46 to engage the buttons 34 on the flange 33. This stencil sheetis somewhat longer than the ink pad so that its other end will extend beyond and over'the groove 36 in the other end of the sheet or segment 28.

In applying 'a pad and a stencil to the sup porting sheet or segment, this is preferably done while the segment is removed from the end 'heads of the cylinder, and in substantially a flat condition.

The'pocket 38 or the 'pad is inserted into the said pocket 38 and into theotherear The pad isthen laid back upon the outside of the supporting sheet or segment to bring its other pocket into aposition convenient with respect to This pad is only wide said printing cylinder.

the groove 36 of. said sheet or segment. The arm 4| of the folding rule-like device 42 is inserted into said pocket, with the other arm standing at an angle of about thereto. The pocket with said arm 4| therein may now be placed in 6 said groove 36.

That end of the stencil sheet 45 having the openings 46 therein, is engaged with the flange 33 with the buttons 34 thereof extending through said openings. This anchors one end of the sten- 1 oil to the segment and inking pad. The stencil .shown in Fig. 5, and at the same time, drawing said end taut. As the bar 42 is so formed in 36, this will secure the associated end of the V stencil sheet to the supporting sheet or-segmentw It is apparent that the supporting sheet or segment, along with the pad and the stencil forms 2 a unit, ready for attachment to the end heads.

To apply this unit, the retainers 3! on the flanges 27 of the heads 26, are turned to extend in the direction of the length of the supporting flanges 27. The retainers 3| will now pass through the marginal openings 30 of the supporting sheet or segment after which said retainers are swung sheet or segment which is now applied to the 3 to extend crosswise of the openings. This looks the unit, comprising the segment, inking pad and stencil, upon the end heads. 7

After the ink has been applied to the inside of the supporting sheet or segment, the machine may be operated in the conventional manner. Should it be desired to do multi-color work, the 4 unit with one ink thereon may be removed and another unit substituted in its stead,

The structures mentioned are simple and efficient for their intended purpose.

While .in describing the invention, 1 have re- 4 ferred in detail to the form, arrangement and construction of the various parts thereof, the same is to be considered only'in an illustrative sense so that I do not wish to be limited thereto exceptas may be specifically set forth in the 5 appended claims. I

I claim as'my invention-' 1. A device of the class described including, in combination, a supporting frame, a printing cylinder, an impression roller, and a rectangular 5 bearing block having lateral slots in the ends 7 adapted to slidably engagethe sides of'said supporting frame, 'said' bearing shaving transverse. I

extensions adapted to rotatably receive said ind-' pression roller, and 'a substantially L shaped 0L- locking bar pivotally mounted on the lower face 7 of said bearing block adapted to releasably engage said supporting frame whereby to-lock saidim- 1 pression roller in spaced relation with respect'to a MAURICE 'BaB RAND. 7

0 V thickness as to have a snug fit in the groove 

